Add logging and tracing to your application

Designers and developers of applications that run with or under WebSphere Application Server - Express, such as servlets and JSP files, and their supporting classes, may find it useful to use the same facility for generating messages that WebSphere Application Server - Express itself uses, JRas.

This approach has advantages over simply adding System.out.println() statements to your code:

• Your messages appear in the WebSphere Application Server - Express standard message format with additional data, such as a date and time stamp, added automatically.
• You can more easily correlate problems and events in your own application to problems and events associated with WebSphere Application Server - Express components.
• You can take advantage of the WebSphere Application Server - Express log file management features.

See the following topics for more information about the JRas facility:

Programming model summary
This topic provides a summary of the JRas programming model and formalizes usage requirements and restrictions.

Overview of JRas
This topic describes message logging and diagnostic trace and explains some basic JRas concepts.

Program with the JRas framework
This topic describes how to use the JRas extensions to incorporate message logging and diagnostic trace into WebSphere Application Server - Express applications.

Extending the JRas framework
This topic defines the various extension points have been defined to JRas extension classes.

JRas messages and trace event types
This topic describes JRas message and trace event types and their associated parameters.